US6760860B1 - Automatic retransmission request layer interaction in a wireless network - Google Patents
Automatic retransmission request layer interaction in a wireless network Download PDFInfo
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- US6760860B1 US6760860B1 US09/859,955 US85995501A US6760860B1 US 6760860 B1 US6760860 B1 US 6760860B1 US 85995501 A US85995501 A US 85995501A US 6760860 B1 US6760860 B1 US 6760860B1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1867—Arrangements specially adapted for the transmitter end
- H04L1/188—Time-out mechanisms
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/1607—Details of the supervisory signal
- H04L1/1671—Details of the supervisory signal the supervisory signal being transmitted together with control information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1829—Arrangements specially adapted for the receiver end
- H04L1/1848—Time-out mechanisms
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1867—Arrangements specially adapted for the transmitter end
- H04L1/1874—Buffer management
- H04L1/1877—Buffer management for semi-reliable protocols, e.g. for less sensitive applications like streaming video
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1803—Stop-and-wait protocols
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L2001/125—Arrangements for preventing errors in the return channel
Definitions
- the present invention relates generally to cellular wireless communication networks; and more particularly to the servicing of packetized communications within such cellular wireless communication networks.
- Wireless networks are well known. Cellular wireless networks support wireless communication services in many populated areas of the world. While wireless networks were initially constructed to service voice circuit-switched voice communications, they are now called upon to support packet-switched data communications as well.
- the Internet, Intranets, and their underlying Wide Area Networks, and Local Area Networks are all packet switched networks.
- packet switched networks all communications to be transmitted from a source to a destination are packetized prior to transmission and reassembled upon receipt.
- These networks are capable of servicing both data communications and multimedia services such as Voice Over IP (VOIP) communications.
- VOIP Voice Over IP
- the OSI model includes, from lowest protocol layer to highest protocol layer, (1) the physical layer, (2) the data link layer, (3) the network layer, (4) the transport layer, (5) the session layer, (6) the presentation layer, and (7) the application layer.
- a corresponding TCP/IP reference model includes (1) the physical layer, (2) the network interface layer, (3) the Internet layer, (4) the transport layer, and (5) the application layer.
- Networked devices e.g. computer terminals, wireless network mobile stations, etc., operating according to these standards support error free transfer of data communications. Thus, almost all devices supporting data communications operate according to one or more variations of these operating standards.
- ARQ Automatic Retransmission reQuest
- the client computer requests the download of a file.
- the web server accesses the file, subdivides the requested file into a plurality of data packets, and uniquely identifies each data packet.
- the web server transmits each of the data packets to the client computer.
- the client computer Upon receipt of all of the data packets, the client computer combines the data packets in the correct order to reconstruct the file.
- the client computer may not successfully receive all of the data packets from the web computer due to lost/erroneous transmissions. When this occurs, the client computer automatically sends a request to the web server to retransmit a lost/erroneously received packet. ARQ operations continue until the client computer correctly receives all data packets that make up the file.
- ARQ operations are particularly important in wireless networks, e.g., cellular and satellite networks that networks support wireless links between a base station and a serviced mobile station. Wireless links are subject to interference, fading, and other factors that oftentimes prevent successful first time transmission of data packets.
- more than one protocol layer may support ARQ operations, e.g., transport layer and link layer.
- the physical layer may also support ARQ operations.
- the ARQ operations of the multiple protocol layers may interfere with one another. Such interference introduces additional delays in the packet data transmissions and, in some cases, may results in unnecessary higher-layer retransmission or may cause a transmission to fail by inadvertently causing a higher-layer time-out event.
- a base station, mobile station, and/or other terminal includes physical layer (layer 1 ) protocol and link layer (layer 2 ) protocol enhancements that interact with one another to prevent unnecessary link layer ARQ operations. These enhancements cause the link layer protocol to prevent ARQ operations for data blocks having missing data packets that are still pending at the physical layer.
- a physical layer protocol operating on a mobile station receives a data packet from a base station across a wireless link.
- the physical layer protocol determines, a number, N, of data packets pending with its physical layer protocol Automatic Retransmission reQuest (ARQ) operations.
- the physical layer protocol then passes the data packet and the number, N, to a link layer protocol operating on the mobile station.
- the link layer protocol modifies its ARQ operations based upon the number, N, of data packets pending with the physical layer protocol ARQ operations. In modifying its ARQ operations, the link layer avoids initiating ARQ operations for data blocks missing data packets that are still pending with the physical layer.
- the link layer may also determine that it must initiate ARQ operations. According to one embodiment of these operations, upon the receipt of each data packet from the physical layer, the link layer determines its total number of missing data packets. Then, based upon the number, N, the link layer determines that physical layer ARQ operations have failed for at least one missing data packet of a corresponding data block. The link layer then initiates ARQ operations for the corresponding data block.
- These operations also apply when the physical layer sends a packet erasure indication to the link layer.
- the physical layer determines that its ARQ operations have failed to recover a missing data packet and generates a packet erasure indication for the data packet.
- the physical layer also determines a number, M, of data packets pending with its ARQ operations.
- the physical layer then passes the data packet erasure indication to the link layer protocol operating on the mobile station.
- the link layer protocol modifies its ARQ operations based upon the number, M, of data packets pending with the physical layer protocol ARQ operations.
- the link layer maintains a counter for each data block having missing data packets. Then, when the link layer determines that the counter value exceeds the number, N, it initiates ARQ operations for the data block having missing data packets. The link layer also modifies these counter values when a missing packet is received to account for the received data packet.
- These operations may be embodied as method or steps performed by a base station, mobile station, or another device implementing the physical layer protocol and the link layer protocol. These operations may also be embodied in software instructions contained on a media of a base station, mobile station, or another device implementing the physical layer protocol and the link layer protocol. Further, these operations may be embodied in software operations stored on a media or transported via a computer network that may be executed by a base station, mobile station, or another device implementing the physical layer protocol and the link layer protocol.
- FIG. 1 is a system diagram illustrating a portion of a cellular wireless network constructed according to the present invention
- FIG. 2 is a block diagram illustrating the OSI components residing upon a mobile station and a base station that operate according to the present invention
- FIG. 3 is a block diagram illustrating the OSI components residing upon a mobile station and a wired/wireless terminal that operate according to the present invention
- FIG. 4 is a logic diagram generally illustrating operation according to the present invention.
- FIGS. 5 and 6 are logic diagrams illustrating operation according to the present invention by a layer 2 protocol upon receipt of a packet from a layer 1 protocol;
- FIG. 7 is a logic diagram illustrating operation according to the present invention by a layer 2 protocol in determining whether layer 1 ARQ operations have failed for particular data block(s) and in operating accordingly;
- FIG. 8 is a logic diagram illustrating operation according to the present invention by a layer 2 protocol upon receipt of a data packet erasure from a layer 1 protocol;
- FIG. 9 is a block diagram illustrating a base station constructed according to the present invention.
- FIG. 10 is a block diagram illustrating a mobile station constructed according to the present invention.
- FIG. 1 is a system diagram illustrating a portion of a cellular wireless network constructed according to the present invention.
- the cellular wireless network includes a wireless network infrastructure 102 , base station 104 , and base station 106 .
- the cellular wireless network operates according to an operating standard that may have been modified according to the present invention, e.g., HSDPA, 1 xEV, etc. However, the operations of the present invention may be implemented in some cases without modification of existing standards.
- the wireless network infrastructure 102 couples to the Internet 114 .
- the wireless network infrastructure 102 also couples to the Public Switched Telephone Network (PSTN) 110 .
- PSTN Public Switched Telephone Network
- the network infrastructure 102 is circuit switched, couples directly to the PSTN 110 , and couples to the Internet 114 via a gateway (G/W) 112 .
- the network infrastructure is packet switched, couples directly to the Internet 114 , and couples to the PSTN via an interworking function (IWF) 108 .
- IWF interworking function
- a conventional voice terminal 120 couples to the PSTN 110 .
- a VoIP terminal 122 and a personal computer 124 couple to the Internet 114 .
- Mobile stations 116 , 118 , 126 , 128 , 130 , 132 , 134 , and 136 wirelessly couple to the wireless network via wireless links with the base stations 104 and 106 .
- mobile stations may include cellular telephones 116 and 118 , laptop computers 126 and 134 , desktop computers 128 and 136 , and data terminals 130 and 132 .
- the wireless network supports communications with other types of mobile stations as well.
- Each of the base stations 104 and 106 services a cell/set of sectors within which it supports wireless communications.
- Wireless links that include both forward link components and reverse link components support wireless communications between the base stations and their serviced mobile stations. These wireless links support both data communications and multimedia communications, such as VoIP.
- the teachings of the present invention may be applied equally to any type of packetized communication.
- Each of the base stations 106 and 108 and at least some of the mobile stations 116 , 118 , 126 , 128 , 130 , 132 , 134 , and 136 support layer 1 (physical layer) ARQ and layer 2 (link layer) ARQ operations. Further, according to the present invention, layer 1 ARQ operations work in cooperation with layer 2 ARQ operations to avoid unnecessary retransmission requests. Generally speaking, when layer 1 passes a data packet or a packet erasure to layer 2 , it also passes to layer 2 an indication of the number of packets pending with its ARQ operations. Layer 2 keeps track of the pending layer 1 packets and does not request retransmission of data blocks corresponding to these pending layer 1 packets. These operations will be described in particular with reference to FIGS. 4-8.
- FIG. 2 is a block diagram illustrating the OSI components residing upon a mobile station and a base station that operate according to one embodiment of the present invention.
- the mobile station supports all seven ISO protocol layers.
- the base station may also support all seven ISO protocol layers.
- the base station employs only the physical layer and link layer in servicing a communication between the mobile station and a wired terminal. In this operating scenario, the base station simply relays layer 2 packets between the mobile station and the wired terminal.
- the protocol layer operations of FIG. 2 are compliant with one of a number of various standards, e.g., 1 xEV, HSDPA, or another various standards. These standards will typically include both layer 1 and layer 2 components. While layer 1 is typically referred to as the physical layer, layer 2 is referred to using various terms, the particular term, e.g., Radio Link Protcol (RLP), etc., used dependent upon the standard. The teachings of the present invention may be applied to any operating standard in which layer 1 and layer 2 both support ARQ operations.
- RLP Radio Link Protcol
- the teachings of the present invention may be applied to various ARQ operations.
- some ARQ operations employ a “stop-and-wait” (SAW) methodology in which packets are recovered in order.
- SAW stop-and-wait
- some other ARQ operations doe not recover packets in order, e.g., Motorola's dual channel SAW, 1 xEV-DO's 4 channel SAW, Lucent's asynchronous Incremental Redundancy, and Nortel's NCP (Non-complete Puncture), among others.
- SAW stop-and-wait
- NCP Non-complete Puncture
- layer 1 and layer 2 of both the mobile station and the base station have been modified according to the present invention.
- layer 1 includes a L 1 -L 2 modification while layer 2 includes a L 2 -L 1 modification.
- the L 1 -L 2 modification causes layer 1 to report the number of packets that are pending with its ARQ operations with the presentation of each valid data packet and each with erasure.
- the L 2 -L 1 modification prevents layer 2 from initiating ARQ operations for data blocks having missing data packets for which layer 1 ARQ operations are still pending.
- FIG. 3 is a block diagram illustrating the OSI components residing upon a mobile station and a wired/wireless terminal that operate according to the present invention. As compared to the components of FIG. 2, in FIG. 3 the layer 1 and layer 2 modifications reside on the mobile station and the wired terminal.
- FIGS. 2 and 3 show the modifications of the present invention residing on both communicating terminals
- the layer 1 and layer 2 modifications of the present invention may be implemented on a single device to provide benefits in the operation of the device.
- the bulk of data transmitted is carried on the forward link from the base station to the mobile station.
- Including the modifications of the present invention upon the mobile station provides advantages by reducing the number of unnecessary retransmissions on the forward link. These advantages may be obtained without implementing the layer 1 and layer 2 modifications in the base station (or wired terminal).
- FIG. 4 is a logic diagram generally illustrating operation according to the present invention. Operation commences with the initiation of a transmission that includes a wireless path between a base station and a mobile station.
- a transmission that includes a wireless path between a base station and a mobile station.
- One example of such a transmission occurs when mobile laptop computer 126 requests the download of a file from server computer 124 coupled to the Internet.
- the server computer 124 initiates the transmission of data to the laptop computer 126 via the Internet 114 , the gateway 112 if required, the wireless network infrastructure 102 , and the base station 104 to the laptop computer 124 (step 402 ).
- layer 2 operating upon the server computer 124 segregates the file into a number of data blocks and layer 1 operating upon the server computer 124 segregates each data block into a plurality of data packets.
- Layer 1 (physical layer) operating upon the laptop computer 126 receives a packet, determines that it is error free, and delivers the error-free packet to layer 2 (link layer). According to the present invention, with the packet the physical layer of the laptop computer 124 also delivers the number of prior packets, N, that are pending recovery (step 404 ).
- the link layer then receives the packet, processes the packet, and processes the pending packet indication, N (step 406 , the details of which are described with reference to FIGS. 5 and 6 ).
- the physical layer passes an erasure to the link layer along with a pending packet indication, M. These operations are described with reference to FIG. 8 .
- the link layer then checks/updates the counters it maintains for data blocks having missing packets (step 408 , the details of which will be described with reference to FIG. 7 ).
- the physical layer may receive the missing data packets and pass them to the link layer out of sequence.
- the operations of step 408 are performed so that the link layer will only initiate ARQ operations for particular data blocks after the physical layer has completed its ARQ operations for the missing data packets of the data blocks.
- the operations of FIG. 4 are performed until the transmission is complete (or it fails). In such case, as determined at step 410 , operation ends.
- FIGS. 5 and 6 are logic diagrams illustrating operation according to the present invention by a layer 2 protocol upon receipt of a packet from a layer 1 protocol.
- the physical layer delivers an error-free packet X to the link layer, it also includes the number, N, of physical layer packets prior to packet X that are pending recovery at the physical layer.
- the link layer receives the physical layer packet X and the associated information N, it checks the sequence number, S, of the received physical layer packet with the next expected sequence number, V(R), maintained by the link layer (step 502 ). If [S >V(R) ] (step 504 ), the received packet has a greater sequence number than the expected physical layer packet (new data loss is detected) and operation proceeds to step 512 .
- C DP Counter Count data — pending
- the link layer sends NAK requests for the missing data packets/data block (step 514 ).
- the link layer then starts a NAK timer for the missing data packets/data block (step 516 ) and operation proceeds to FIG. 7 . If the NAK_TIMER expires before the missing data is received, the link layer ARQ protocol can either ask for the next retransmission or abort the link layer ARQ for this data block.
- step 508 of FIG. 5 operations continue from step 508 of FIG. 5 where it was determined that previously detected missing data has arrived.
- This previous data may arrive as a result of a normal operation, a physical layer ARQ operation, or a link layer ARQ operation.
- the link layer determines whether the received data packet is a duplicate (step 602 ). If the data packet is a duplicate, operation proceeds to FIG. 7 (step 604 ).
- the link layer stores the packet in the appropriate location in a re-sequencing buffer (step 606 ). Then, the link layer determines whether an associated counter for the missing data block, C DP , is active (step 608 ). If a C DP counter is active for the data block, the link layer reduces the C DP counter by one and reduces the C DP associated with subsequent missing data blocks by one (step 610 ). From step 610 , operation proceeds to FIG. 7 . If an associated counter for the missing data block, C DP is not active/is disabled (as determined at step 608 ) this implies that a layer 2 NAK was previously generated for this missing data packet.
- FIG. 7 is a logic diagram illustrating operation according to the present invention by a layer 2 (link layer) protocol in determining whether layer 1 (physical layer) ARQ operations have failed for particular data block(s) and in operating accordingly.
- the operations of FIG. 7 are performed upon the receipt of either a packet from layer 1 or a packet erasure from layer 1 . According to these operations, the link layer considers a first data block with missing data (step 702 ).
- step 710 it is determined whether the missing data block under consideration. If so, operation proceeds to step 410 of FIG. 4 (step 712 ). If not, operation returns to step 702 where a next data block with missing data is considered.
- the DELAY_TIMER expires before any NAK is generated for the missing data block, a NAK requesting retransmission of the data block is sent by the link layer to the physical layer.
- the DELAY_TIMER is used as a safe-guard for the case where the physical layer is unable to detect an erasure due to poor signal-to-interference level.
- the C DP and DELAY_TIMER associated with the data block are disabled.
- the operations of the present invention may also be realized by storing the delta between N (this missing data block) and N (previous missing data block) in the C DP counter (this missing data block). This approach would realize the same benefits in a slightly different manner.
- FIG. 8 is a logic diagram illustrating operation according to the present invention by a layer 2 (link layer) protocol upon receipt of a packet erasure from a layer 1 (physical layer) protocol.
- the physical layer recognizes that its ARQ operations have failed for a particular physical layer data packet, it delivers an erasure indication to the link layer with the number of prior packets, M, pending recovery at the physical layer (step 802 ). Based upon this information, the link layer updates its information regarding missing data blocks still have data packet recovery operations pending at the physical layer.
- FIG. 9 is a block diagram illustrating a base station 902 constructed according to the present invention.
- FIG. 9 is a block diagram illustrating a base station 902 constructed according to the present invention that performs the operations previously described herein.
- the base station 902 supports an operating protocol, e.g., IS-95A, IS-95B, IS-2000, GSM-EDGE, and/or various 3G and 4G standards that are compatible with the teachings of the present invention, with our without modification thereto.
- the base station 902 supports other operating standards.
- the base station 902 supports protocol layer operations such as those described with reference to FIG. 2 .
- the base station 902 includes a processor 904 , dynamic RAM 906 , static RAM 908 , Flash memory, EPROM 910 and at least one data storage device 912 , such as a hard drive, optical drive, tape drive, etc. These components (which may be contained on a peripheral processing card or module) intercouple via a local bus 917 and couple to a peripheral bus 920 (which may be a back plane) via an interface 918 . Various peripheral cards couple to the peripheral bus 920 . These peripheral cards include a network infrastructure interface card 924 , which couples the base station 902 to the wireless network infrastructure 950 . Digital processing cards 926 , 928 , and 930 couple to Radio Frequency (RF) units 932 , 934 , and 936 , respectively.
- RF Radio Frequency
- Each of these digital processing cards 926 , 928 , and 930 performs digital processing for a respective sector, e.g., sector 1 , sector 2 , or sector 3 , serviced by the base station 902 .
- each of the digital processing cards 926 , 928 , and 930 will perform some or all of processing operations described with reference to FIGS. 6 and 7.
- the RF units 932 , 934 , and 936 couple to antennas 942 , 944 , and 946 , respectively, and support wireless communication between the base station 902 and mobile stations (the structure of which is shown in FIG. 9 ).
- the base station 902 may include other cards 940 as well.
- Hybrid Automatic Retransmission reQuest Instructions (HARQI) 916 are stored in storage 912 .
- the HARQI 916 are downloaded to the processor 904 and/or the DRAM 906 as HARQI 914 for execution by the processor 904 . While the HARQI 916 are shown to reside within storage 912 contained in base station 902 , the HARQI 916 may be loaded onto portable media such as magnetic media, optical media, or electronic media. Further, the HARQI 916 may be electronically transmitted from one computer to another across a data communication path. These embodiments of the HARQI are all within the spirit and scope of the present invention.
- the base station 902 Upon execution of the HARQI 914 , the base station 902 performs operations according to the present invention previously described herein with reference to FIGS. 1-8.
- the HARQI 916 may also be partially executed by the digital processing cards 926 , 928 , and 930 and/or other components of the base station 902 . Further, the structure of the base station 902 illustrated is only one of many varied base station structures that could be operated according to the teachings of the present invention.
- FIG. 10 is a block diagram illustrating a mobile station 1002 constructed according to the present invention that performs the operations previously described herein.
- the mobile station 1002 supports a CDMA operating protocol, e.g., IS-95A, IS-95B, IS-2000, and/or various 3G and 4G standards that are compatible with the teachings of the present invention, with or without modification.
- a CDMA operating protocol e.g., IS-95A, IS-95B, IS-2000, and/or various 3G and 4G standards that are compatible with the teachings of the present invention, with or without modification.
- the mobile station 1002 supports other operating standards.
- the mobile station 1002 includes an RF unit 1004 , a processor 1006 , and a memory 1008 .
- the RF unit 1004 couples to an antenna 1005 that may be located internal or external to the case of the mobile station 1002 .
- the processor 1006 may be an Application Specific Integrated Circuit (ASIC) or another type of processor that is capable of operating the mobile station 1002 according to the present invention.
- the memory 1008 includes both static and dynamic components, e.g., DRAM, SRAM, ROM, EEPROM, etc. In some embodiments, the memory 1008 may be partially or fully contained upon an ASIC that also includes the processor 1006 .
- a user interface 1010 includes a display, a keyboard, a speaker, a microphone, and a data interface, and may include other user interface components.
- the RF unit 1004 , the processor 1006 , the memory 1008 , and the user interface 1010 couple via one or more communication buses/links.
- a battery 1012 also couples to and powers the RF unit 1004 , the processor 1006 , the memory 1008 , and the user interface 1010 .
- Hybrid Automatic Retransmission reQuest Instructions (HARQI) 1016 are stored in memory 1008 .
- the HARQI 1016 are downloaded to the processor 1006 as HARQI 1014 for execution by the processor 1006 .
- the HARQI 1016 may also be partially executed by the RF unit 1004 in some embodiments.
- the HARQI 1016 may be programmed into the mobile station 1002 at the time of manufacture, during a service provisioning operation, such as an over-the-air service provisioning operation, or during a parameter updating operation. Upon their execution, the HARQI 1014 cause the mobile station 1002 to perform operations according to the present invention previously described with reference to FIGS. 1-8.
- the structure of the mobile station 1002 illustrated is only an example of one mobile station structure. Many other varied mobile station structures could be operated according to the teachings of the present invention.
- the mobile station 1002 Upon execution of the HARQI 1014 , the mobile station 1002 performs operations according to the present invention previously described herein in servicing a VOIP telephony call.
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Cited By (37)
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US20010032325A1 (en) * | 2000-04-17 | 2001-10-18 | Mo-Han Fong | Dual protocol layer automatic retransmission request scheme for wireless air interface |
US20010039589A1 (en) * | 2000-05-03 | 2001-11-08 | Outi Aho | Method for transmitting messages |
US20020162045A1 (en) * | 2001-04-27 | 2002-10-31 | Nec Corporation | Communication device that performs automatic failure recovery and automatic failure recovery method |
US20020191544A1 (en) * | 2001-04-25 | 2002-12-19 | Cheng Mark W. | Method and system for interlayer control between re-sequencing and retransmission entities |
US20020191594A1 (en) * | 2000-08-24 | 2002-12-19 | Tomoaki Itoh | Transmitting/receiving method and device therefor |
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